Abstract: An illumination module includes a light emitting unit, an optical lens with positive refractive power, and a concave mirror. At least one of an object-side surface and an image-side surface of the optical lens is an asymmetrical surface, and the light emitting unit is provided at an object side of the optical lens. The concave mirror is provided at an image side of the optical lens, and the concave mirror acts as an optical path folding element. Light emitted by the light emitting unit passes through the optical lens and is reflected by the concave mirror to be a parallel light ray.

Abstract: An illumination module includes a light emitting unit, an optical lens with positive refractive power, and a concave mirror. At least one of an object-side surface and an image-side surface of the optical lens is a free-form surface, and the light emitting unit is provided at an object side of the optical lens. The concave mirror is provided at an image side of the optical lens, and the concave mirror acts as an optical path folding element. Light emitted by the light emitting unit passes through the optical lens and is reflected by the concave mirror to be a parallel light ray.

Abstract: A low-shrinkage photocurable material is provided in the present disclosure. The low-shrinkage photocurable material includes an acrylonitrile butadiene styrene resin, a carbon black and a dispersant. The carbon black and the dispersant are mixed with the acrylonitrile butadiene styrene resin. The weight percentage of the acrylonitrile butadiene styrene resin is 85%-99.45%, the weight percentage of the carbon black is 0.05%-5%, and the weight percentage of the dispersant is 0.5%-10%.